Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is saying that a sensor checking the temperature of the motor is getting a reading that's too high.
This code indicates that the temperature sensor for Drive Motor 'A' is reporting a temperature that is higher than expected.
The P1B70 code is triggered when the powertrain control module (PCM) detects an abnormally high temperature reading from the temperature sensor 'B' associated with Drive Motor 'A'. This could be due to a faulty sensor, wiring issues, or actual overheating of the motor.
• Illuminated check engine light
• Reduced vehicle performance
• Possible overheating warning
• Faulty temperature sensor
• Wiring issues or poor connections
• Actual overheating of the drive motor
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
• Scan the vehicle for additional codes
• Inspect the wiring and connections to the temperature sensor
• Test the temperature sensor for proper operation
• Replace the faulty temperature sensor
• Repair or replace damaged wiring
• Ensure the drive motor is not overheating
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regular maintenance checks
• Ensure proper cooling system function
• Monitor vehicle performance
Sensor Issue
• Do not ignore the check engine light
• Seek professional diagnosis if unsure
• Monitor vehicle temperature regularly
Check with the vehicle manufacturer for specific warranty coverage on sensors and related components.
This code has become more common with the increased use of electric and hybrid vehicles, which rely heavily on motor temperature sensors.
Moderate – While the vehicle may still operate, ignoring this code could lead to motor damage.
Driving with an overheating motor can cause serious damage and may void warranties. Always address warning lights promptly.
• Vehicle at operating temperature
• Drive motor engaged
The temperature sensor is typically located near the drive motor, often integrated into the motor housing or nearby components.
Q: Can I drive my car with this code?
A: It's not recommended as it may lead to further damage if the motor is actually overheating.
Q: How do I know if the sensor is faulty?
A: A professional can test the sensor with a multimeter to check for proper operation.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.